[octavia-ingress-controller] support wildcard in the host field

[gmauleon]

What this PR does / why we need it: Support wildcard for the host field in ingress resource

Which issue this PR fixes(if applicable): fixes #2245

Special notes for reviewers:

Release note:

NONE

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Hi @gmauleon. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[jichenjc]

/ok-to-test

[jichenjc]

please also update Release note:

[mdbooth]

For reference, here's the relevant part of the definition of host:

        // host can be "precise" which is a domain name without the terminating dot of
        // a network host (e.g. "foo.bar.com") or "wildcard", which is a domain name
        // prefixed with a single wildcard label (e.g. "*.foo.com").
        // The wildcard character '*' must appear by itself as the first DNS label and
        // matches only a single label. You cannot have a wildcard label by itself (e.g. Host == "*").
        // Requests will be matched against the host field in the following way:
        // 1. If host is precise, the request matches this rule if the http host header is equal to Host.
        // 2. If host is a wildcard, then the request matches this rule if the http host header
        // is to equal to the suffix (removing the first label) of the wildcard rule.
        // +optional
        Host string

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/lifecycle stale

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/lifecycle rotten

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/close

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@k8s-triage-robot: Closed this PR.

In response to this:

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

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• After 90d of inactivity, lifecycle/stale is applied
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/close

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